Relativistic detuning limit on energy in electron cyclotron resonance x-ray source

Abstract

In this paper, a detailed theoretical analysis of electron acceleration in a TE111 cylindrical resonant cavity used as a cyclotron resonance accelerator is presented. The relativistic detuning limit on energy is found to depend critically on the externally applied dc magnetic field. The optimum value of the magnetic field, for a given operating frequency, electric field, and the cavity dimensions, is calculated. The cavity dimensions are optimized to get maximum peak-to-peak electric field so that higher electron energy can be obtained. It is also shown that most of the electrons, depending on the time of emission, end up in two accelerating bunches.

Experimental studies on a compact electron cyclotron resonance plasma x-ray source

“…This will restrict the maximum attainable energy by the electrons. In our earlier work, 26 the relativistic effect was included and from the computational results it was found that the relativistic detuning limit on energy depends critically on the externally applied dc magnetic field. To enhance the maximum attainable electron energy, the cavity dimension can be optimized so that higher E 0 value can be achieved for the same quality factor (Q) of the cavity.…”

“…In recent years, the ECR technique has been used for the production of x-rays. [22][23][24][25][26][27] The microwave source ͑frequency and power͒ used in ECR plasma x-ray source is similar to that of microwave ion source/plasma deposition systems. It is to be noted that the magnetic field configuration is different in ECR x-ray source compared to other ECR plasma devices and also, here the plasma is produced in a cavity.…”

“…The important factors which affect the electron current and energy are ͑i͒ Electron temperature у5 keV 10-20 eV ͑bulk͒ ϳ100 eV ͑hot͒ microwave power, ͑ii͒ electron source term ͑filament͒, and ͑iii͒ collision term, and ͑iv͒ magnetic field configuration and these are analyzed in our recent study. 27 These theoretical studies, 22,26,27 are carried out in an empty cylindrical cavity. The source of high energy electrons ͑Ͼ100 keV͒ in ECR plasma x-ray source is not understood and so, it is very important to study the plasma characterization studies.…”

Analysis of x-ray spectrum obtained in electron cyclotron resonance x-ray source

“…The electron acceleration in TE 111 cylindrical cavity is studied using single-particle motion. 11,12,16 The relativistic detuning limit on the final energy of electron is studied as a function of external magnetic field. The present source strength has to be enhanced for reducing the exposure time for imaging applications.…”

“…[8][9][10] In recent years, x-ray source has been made based on ECR technique and the source is called ECR x-ray source. [11][12][13][14][15][16][17][18][19][20] In ECR x-ray source, electrons are accelerated continuously by matching the cyclotron frequency of the electrons to the microwave frequency ͑2.45 GHz͒. After gaining sufficient energy, these electrons collide with the target/cavity wall and produce bremsstrahlung x rays.…”